Who's your hero?

My late grandfather was a fantastic guy.  He worked hard his entire life to take care of the family.  He had (and made) friends everywhere he went.  He was sweet, charming, and generous to a fault.  He stood up for what he believed in and encouraged the same in his family.  My world isn't the same without him.  He was, without question, a hero to me.  Who's your hero? What about them makes them your hero?